Pump



C. S. McCLELLAND PUMP. APPLBCATION FILED MAYl4,1921.

I Patented Aug. 8, 1922,

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CHARLES S. McCL ELLAN-D, OF PITTSBURGH, PENNSYLVANIA.

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I Specification of Letters Patent.

Patented Aug. 8, 1922.

Application filed May 14, 1921. serial No. 466,818.

To all whom it may concern:

Be. it known that I, CHARLES S. MoCLnn ments in Pumps, of whichthe following is a specification.

My invention consists of an improvement in. air, pumps for supplying compressed air to. pneumatic tires, or for any other purpose.

The pump comprises a unitary generally cylindrical structure, comprising a plurality of relatively stationary and movable concentrically arranged. cylinders providing a middle high pressure chamber and outer surrounding medium and low pressure chambers respectively, constructed and adapted to operate in the manner more fully hereinafter described.

The objectin. View is to provide, inma pumpof the type involved, a series of, compressing and storage chambers, within the concentric walls or shells of'the associated members, one of which is movable, whereby to utilize both the LIP-SillOkQ and down stroke for continuous inflow of atmospheric air, andtoefi'ect successive cumulative compressions, with final delivery ofhigh pressure air from the inner-or middle, chamber.

Referring to the drawings, illustrating one preferred embodiment of the invention,

Fig; 1v is a vertical sectional View of a pump constructed according to my invention, with the parts in an intermediate position;

Fig. 2 is a cross section on the'line IIII of Fig. 1;

Fig. 3 is a cross III ofjFig. 1;

Fig. 4 is-a detail plan view of the annular spring tongue plate for resiliently eX- tending the cup leather valve, 7

Fig, 5 is a sectional detail view showing the spring tongue plate in position within the cup leather.

section on the line III- In the drawings, 2 is the base of the pump provided with the usual foot piece or standard, and having an outlet or delivery port 8 communicating with the central final compression or high pressure air chamber 4, and also with the usual delivery pipe or hose 5 of well knownconstruction. Chanr her 4 is provided by means of the central tubular cylindrical shell 6 fixedly secured in the middle portion ofbase 2, extending upwardly therefrom and terminating at the pointshown. Cylinder 6 is provided with a. stationary cup leather 7 secured thereon by outer and inner plates or rings 8, 9', and connecting screws orbol'ts 10, as will be readily understood.

Cup leather 7 is. turned downwardly at its central portion to provide a packing en gagement with the reciprocable central stem or plunger rod 11 which is connected at its upper terminal with theusual cross handle 12. At its lower end, rod '11 is provided with a downwardly turned cup leather 13"v secured by-terminal stud 14, operable to sealv against the inner wall of cylinder. 6 on downward movement, for compression, and to permit by-pass of air downwardly 11113.0. chamber 4: upon upward movement.

Surrounding the middle cylinder 6 and in sliding engagement with the outer downwardly extending annular edge portion of cup leather 7,. is the relatively movable cylinder 15 secured at its upper end to head 16', which is fixedly connected withstem 1'1 and handle 12, asshown. Head 16 is provided with an, air inlet check valve 17 of well known construction, providing for inflow of air on upward movement and sealing" against outflow: on downward movee mentfso as to trap the air in the interior of chamber 18 of cylinder 15, between head 161 and cup leather 7.

Cylinder 15 extends downwardly beyond cup leather 7 as shown, co-extensive with the length of rod 11, and provides between its closed lower terminal and the cup leather .7, andbetween its wall and inner cylinder cup leather. 20 The. latter is turned upwardly by its inner. flange portion around the exteriorof cylinder 6, so as to entrap air in chamber 19 on. upward movement and to admit air into ch'amber.19- upon downward' movement. leather 20 is turned downwardly within and bears against the interior'surfaoe'of the outermost stationary cylinder 21 which, like cylinder 6, is 'fixedlyconnected with and mounted in the base 2, concentric with cylinders 15 and 6.

The upper portion of cylinder 21 is provided with a terminal cap 22, the upper portion of which makesa close sliding fit The outer portion of cup v with the exterior of cylinder 15, as it moves upwardly or downwardly, and a series of air inlet ports 23 open into an annular chamber 24 intervening between said cylinders.

of cylinder 15 by an inner cap plate 25 secured upon the cylinder and an outer coacting plate 26 and connecting screws or bolts 27 Plate 26 is provided with a series of laterally extending thin elastic tongues 28 adapted to be bent downwardly within the exterior annular flange portion 29 of cup leather 20 and to press the same outwardly'at all times against the inner wall of cylinder 21.

for the passage of air from chamber 24 to the enlarged area of chamber 30 intervening between stationary cylinders 6 and 21, below the movable cup leather, and above base 2. The outer flange of cup leather -7 and cup leather 13, as well 'as cup leather 29, are similarly pressed outwardly by the tongues 28 of a similar ring plate or washer 26, secured in the manner shown.

At its upper portion, preferably immediately below the attaching ring 9 of cup leather 7, cylinder 6 is provided with a series of transverse air inlet ports 31 opening into interior chamber 32 between the inner stationary cylinder 6 and the central movable plunger rod. 11.

By this construction, I provide for an inflow. of air into chamber 18 through check valve 17 upon .upward movement of. the stem 11 and cylinder 15 byhandle 12, and on downward movement into concentric chamber 24 through air inlet ports 23,which ports admit air alternately with the admission of air through check valve 17 said check valve being closed'on downward movement. i

The operation throughout is as follows. Assuming the plunger raised to its upper limitof movement, on downward movement any air .in chamber 4 will be ejected through port3, and any air in chamber 30 will pass upwardly within the inner flanges of cup leather 20 into chamber 19 At the same time, atmospheric air will passthrough ports 23 downwardly into chamber 24, until the plunger rod and cylinder 15 are lowered to the bottom position. Upon upward movement, air in chamber 24, due to the partial vacuum created in chamber 30, will pass downwardly thereinto around the outer flange 29 of cup leather 20, and at the same time atmospheric air will flow inwardly through check valve 17 to chamber 18, therebyfill ing both chambers 30and 18. At the sametime, any air in chamber 19 will, on upward movement, be forcedunder compression through ports 31 into chamber 32,

in chamber 4. Cup leather 20 is secured to the lower end Tongues 28 are, however, sufliciently light to permit of receding moves, ment of the cup leather flange 29 on upward "movement of cylinder 15, so as to provide and, due to the partial vacuum created in around cup leather 13, and become trapped The same operation will be repeated upon each downward and upward movement, ad-' mitting fresh air at each movement, through check valve 17 and ports .23 alternately, which is successively and cumulatively compressed, .the final highest compression occurring in chamber 4 of the smallest cross area,

and with the greatest resulting compress-J ing power and action, by the central cup.

leather 13. I

It will be understood that ports 23, '31,

and check'valve 17 may be'varied in num-' her or size, so that the sizes and proportions of the several ports or other details of construction may be changed or varied by the skilled mechanic, but that all such changes are to be considered as within the scope of the following claims.

V 1. A triple cylinder air pump comprising a base, an innermost high pressure cylinder secured in the base and provided with an] air inlet and an outlet delivery port, an

outermost cylinder also mounted in the base provided with an air inlet port, a reciprocable cylinder intervening between said cylinders provided with an air inletport, and a co-acting central nermost cylinder.

plunger within the in-' 2. A triple cylinder air pump comprisingf a base, an innermost highpressure'cy'linder secured in thebase and provided with an air inlet and an outlet delivery port, an outermost cylinder also mounted'in the base provided with an air inlet port, a recipro-' cable cylinder "intervening between said cylinders provided with an air inlet port, a co-acting central plunger within the inner most'cylinder, and'means providing packed sliding engagement between" said several" parts.

3. A triple cylinder air pump comprising a base,,an innermost high pressure cylinder secured in the base and provided with an air inlet and an outlet delivery port, an' outermost cylinder also mounted in thebase provided with an air inlet port, a reciprocable cylinder'intervening between said cylinders provided with an air inlet port, a co-acting central plunger within the innermost cylinder, and means providing packed sliding engagement between said several parts in one direction of movement and adapted to provide intervening air circulationin the other direction. a I V 4. A triple cylinder air pump comprising a base, fan innermost high'pressure cylinder secured in the base in circulating communication with a supply conduit andprovided at its top with a terminal packing cup-and an adjacent air inlet port, an outermost cylinder mounted in the base having a terminal air inlet port, an intervening reciprocable cylinder having at its inner end a packing cup engaging said cylinders, and a central plunger fixedly connected with the reciprocable cylinder having at its inner end a packing cup engaging the innermost cylinder.

5. In combination, a base provided with an outlet conduit, a central high pressure cylinder secured to the base in communication with said conduit and having at its upper end a packing cup and an air inlet port, an outer cylinder secured to the base having an air inlet port at its uppermost end, a central plunger extending through said packing cup provided with a terminal packing cup and an outer handle, and a cylinder fixedly connected therewith having an air inlet valve and extending inwardly between the central and outer cylinder and provided with a terminal packing cup engaging said cylinders.

cylinder secured to the base in communication with said conduit and having at its upper end a packing cup and an air inlet port, an outer cylinder secured to the base having an uppermost air inlet port, a central plunger extending through said packing cup provided with a terminal packing cup and an outer handle, and a cylinder fixedly connected therewith having an air inlet valve and extending inwardly between the outer annular flange, and means for holding said parts in position.

In testimony whereof I hereunto ailix my signature.

CHARLES s. MGOLELLAND. 

